ECG Workout
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,TEST BANK
Table of Contents — ECG Workout: Exercises in Arrhythmia Interpretation, 8th Edition
1. Anatomy and Physiology of the Heart
2. Electrophysiology
3. Waveforms, Complexes, Intervals, and Segments
4. Cardiac Monitors
5. Analyzing a Rhythm Strip
6. Sinus Rhythms
7. Atrial Rhythms
8. Junctional Rhythms and AV Blocks
9. Ventricular Rhythms and Bundle-Branch Block
10. Pacemakers
11. Posttes
Question 1
A patient’s ECG shows a regular rhythm at 72 bpm with upright
P waves before each QRS complex and a consistent PR interval
of 0.16 seconds. Which structure is responsible for initiating
this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The ECG shows normal sinus rhythm: regular rate (60–100
bpm), upright P waves preceding each QRS, and normal PR
interval (0.12–0.20 sec). This indicates impulse initiation from
the SA node, the heart’s primary pacemaker.
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm shows a rate of 68 bpm with each impulse
traveling from atria to ventricles. Which cardiac valve must
open to allow ventricular filling after atrial contraction?
A. Aortic valve
B. Pulmonic valve
C. Mitral valve
D. Tricuspid valve
Correct Answer: C
Rationale:
Blood flows from the left atrium to the left ventricle through
, the mitral valve during atrial contraction, represented by the P
wave and PR interval.
• A and B are semilunar valves (ventricular outflow).
• D is correct for right side, but ECG context typically reflects
systemic flow emphasis; mitral valve is key for left-sided
filling.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm. Which sequence
correctly represents electrical conduction through the heart?
A. AV node → SA node → ventricles
B. SA node → AV node → Bundle of His → Purkinje fibers
C. Purkinje fibers → SA node → AV node
D. Ventricles → atria → AV node
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels to the AV
node, then through the Bundle of His and Purkinje fibers to
depolarize ventricles (QRS complex).
• Other options show incorrect sequence.
Exercises in Arrhythmia Interpretation
8th Edition
Author(s)Jane Huff
,TEST BANK
Table of Contents — ECG Workout: Exercises in Arrhythmia Interpretation, 8th Edition
1. Anatomy and Physiology of the Heart
2. Electrophysiology
3. Waveforms, Complexes, Intervals, and Segments
4. Cardiac Monitors
5. Analyzing a Rhythm Strip
6. Sinus Rhythms
7. Atrial Rhythms
8. Junctional Rhythms and AV Blocks
9. Ventricular Rhythms and Bundle-Branch Block
10. Pacemakers
11. Posttes
Question 1
A patient’s ECG shows a regular rhythm at 72 bpm with upright
P waves before each QRS complex and a consistent PR interval
of 0.16 seconds. Which structure is responsible for initiating
this rhythm?
A. Atrioventricular (AV) node
B. Sinoatrial (SA) node
C. Bundle of His
D. Purkinje fibers
Correct Answer: B
,Rationale:
The ECG shows normal sinus rhythm: regular rate (60–100
bpm), upright P waves preceding each QRS, and normal PR
interval (0.12–0.20 sec). This indicates impulse initiation from
the SA node, the heart’s primary pacemaker.
• A is incorrect: AV node delays conduction but does not
normally initiate rhythm.
• C and D are conduction pathways, not primary
pacemakers.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 2
An ECG rhythm shows a rate of 68 bpm with each impulse
traveling from atria to ventricles. Which cardiac valve must
open to allow ventricular filling after atrial contraction?
A. Aortic valve
B. Pulmonic valve
C. Mitral valve
D. Tricuspid valve
Correct Answer: C
Rationale:
Blood flows from the left atrium to the left ventricle through
, the mitral valve during atrial contraction, represented by the P
wave and PR interval.
• A and B are semilunar valves (ventricular outflow).
• D is correct for right side, but ECG context typically reflects
systemic flow emphasis; mitral valve is key for left-sided
filling.
Source:
ECG Workout: Exercises in Arrhythmia Interpretation, 8th
Edition – Chapter 1
Question 3
A patient’s ECG shows normal sinus rhythm. Which sequence
correctly represents electrical conduction through the heart?
A. AV node → SA node → ventricles
B. SA node → AV node → Bundle of His → Purkinje fibers
C. Purkinje fibers → SA node → AV node
D. Ventricles → atria → AV node
Correct Answer: B
Rationale:
Normal conduction begins at the SA node, travels to the AV
node, then through the Bundle of His and Purkinje fibers to
depolarize ventricles (QRS complex).
• Other options show incorrect sequence.
